Discussion on failure analysis of lithium battery protection board

2021-09-07 10:42:29 0

Lithium batteries are one of the commonly used battery types in life, and we are naturally very familiar with lithium batteries. In order to enhance everyone's understanding of lithium batteries, this article will introduce the lithium battery protection board, the main content is to explain the fault judgment of the lithium battery protection board.

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A summary of the causes of abnormal lithium batteries, including lithium battery capacity, lithium battery internal resistance, lithium battery voltage, ultra-thick size, open circuit, etc. The battery capital has briefly summarized and shared with everyone.

1. Low battery capacity


a. The amount of attached material is too small;

b. There is a big difference in the amount of material attached to both sides of the pole piece;

c. The pole piece is broken;

d. Less electrolyte;

e. Low electrolyte conductivity;

f. The positive and negative electrodes are not matched;

g. The diaphragm porosity is small;

h. Adhesive aging → attached material falls off;

i. The core is very thick (not dried or not penetrated by the electrolyte)

j. It is not fully charged when dividing capacity;

k. The specific capacity of the positive and negative materials is small.

2. High battery internal resistance


a. Welding of the negative electrode and the tab;

b. Welding of the positive electrode sheet and the tab lug;

c. Welding of the positive electrode ear and the cap;

d. Welding of the negative electrode ear and the shell;

e. The internal resistance of the contact between the rivet and the pressure plate is large;

f. No conductive agent is added to the positive electrode;

g. There is no lithium salt in the electrolyte;

h. The battery has been short-circuited;

i. Diaphragm paper has low porosity